I would stay away from the CASH RINGS at PokerStars, they aren't so good... and that those low levels, you run into a lot of donkeys... that will call with almost anything... i've seen a lot of bad beats... so you don't want to risk going all in with AA and getting cracked by 7 8...
your best bet, is to do the $1 tournaments... you have to figure out, how big of a tournament you can handle... you might want to start with the 45 sit and go... then work your way up.
Good Luck at the Tables